1. since the gear pump body operates under high temperature, hinged support shall be set on the piping during cold installation to prevent piping displacement after temperature rise.
2. the coupling must be hot aligned after the pump body is heated to avoid additional torque during operation.
3. the pump outlet pressure measuring point shall be set with interlocking stop alarm, otherwise, once the discharge pipe is blocked, the pump body may be damaged.
4. when starting the gear pump, do not increase the speed blindly when there is no pressure at the outlet to prevent premature damage of the shaft or bearing.
5. when cleaning the liquid transfer, do not use the pump to deliver the cleaning liquid. Remove the internals and install them after the liquid transfer to avoid foreign matters in the pump.
6. the temperature of the heat medium jacket of the pump body can be slightly lower than that of the front and rear jacket. Because the melt viscosity is a decreasing function of the shear rate, the extrusion of the gear and the shear of the bearing will increase the melt temperature by 3 ~ 5 ℃ after the pump. Reducing the temperature of the heat medium can prevent the melt degradation. The data shows that by reducing the temperature in the bearing area, the bearing capacity of the bearing can be greatly increased. It is not necessary to replace the pump with large capacity. The output capacity of the gear pump can be increased by 50% only by increasing the speed.
7. speed up shall be carried out slowly, and the front and rear pressure shall not rise sharply, so as not to damage the bearing or block the lubrication channel with the melt.
8. the melt filter behind the pump outlet shall be replaced regularly, and it is not allowed to operate under high pressure or even the upper pressure limit for a long time.
9. regular replacement of bearings can save maintenance costs. When it is found that the wear on the inner surface of the shaft or bearing is close to the thickness of the hardened layer, the shaft can be polished and reused, and only the bearing can be replaced, which can prolong the service life of the pump shaft by 8 ~ 10 years.
10. in case of power failure or interruption of heat medium circulation for more than 30min, the pump shall be disassembled, cleaned and reassembled to avoid damage to the pump due to poor bearing lubrication caused by melt solidification and cracking.
